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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca3a36ae4a30944841d54dfc6bc61a5bcb355dfc834992819791a0038557138' 
  AND token = 'sKYRogJZirgKFfUVapZ9X1ppC1XZo9Kga5cCHPE0YWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}